1. It smells funky.
2. It has funky little clumps/dots in it.
3. It is gummy or stringy.
..........then I pitch it!!!!!!! They are only $1.30 here and not worth the aggravation of trying to use glycerin to revive it back to life. It is too easy to just buy a new bottle in my opinion.
My 2 cents worth,
1. Heat & humidity
Is it really hot & humid in your house/kitchen? I would recommend refrigerating it then.
2. Perishable filling
Did you put a perishable filling in between your cake layers? If yes, then it must be refrigerated.
3. Perishable icing
Did you use a cream cheese or whipped icing that is perishable? If yes, then it must be refrigerated.
Store unopened can at room temperature, not over 90°F.
Stir room temperature frosting in can before using (cold frosting is difficult to spread).
Cool cake completely. Brush loose crumbs off cake before frosting.
Cover and refrigerate any remaining frosting for up to 2 weeks.
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